Pneumatic actuator

Abstract

The invention relates to the technical field of actuators, and discloses a pneumatic actuator which comprises a pipe body, a containing hole is formed in the end face of the pipe body, a cover body is arranged at one end of the pipe body, a base is connected to the end face, away from the cover body, of the containing hole in an inserted mode, and a locking ring groove is formed in the inner circumferential face of the containing hole. A locking ring groove is formed in the base, an elastic clamping ring for limiting separation from the containing hole is arranged in the locking ring groove, a limiting ring is arranged on the outer circumferential face of the base, a movable part located in the containing hole is rotationally connected to the base, and a piston structure used for driving the movable part to rotate is arranged in the containing hole; when the base moves in the direction away from the cover body, the elastic clamping ring is located on the moving path of the limiting ring, and the beneficial effects that quick-wear parts are convenient to replace, and the maintenance cost is reduced are achieved.

Description

Technical Field

[0001] The present application relates to the technical field of actuators, and in particular to a pneumatic actuator. Background Art

[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve.

[0003] A pneumatic actuator in the related art includes a housing, with covers welded to both ends of the housing, a rotating member rotatably connected to one of the covers, and a piston structure for driving the rotating member to rotate is arranged in the housing.

[0004] During the use of pneumatic actuators, the sealing rings and other vulnerable parts inside the pneumatic actuators will be worn. When the sealing rings and other vulnerable parts are worn to a certain extent, the actuator will be damaged. If the existing vulnerable parts are damaged, the pneumatic actuator can only be replaced as a whole, which has a high maintenance cost. Summary of the invention

[0005] In order to improve the problem that wearing parts are difficult to replace, the present application provides a pneumatic actuator.

[0006] The present application provides a pneumatic actuator, which adopts the following technical solution: A pneumatic actuator comprises a tube body, an end face of the tube body is provided with a receiving hole, one end of the tube body is provided with a cover body, the end face of the receiving hole away from the cover body is plugged with a base, the inner circumferential face of the receiving hole is provided with a locking ring groove, an elastic retaining ring for limiting separation from the receiving hole is provided in the locking ring groove, a limiting ring is provided on the outer circumferential face of the base, a movable part located in the receiving hole is rotatably connected to the base, and a piston structure for driving the movable part to rotate is provided in the receiving hole; when the base moves in a direction away from the cover body, the elastic retaining ring is located on the moving path of the limiting ring.

[0007] By adopting the above technical solution, when it is necessary to replace the internal sealing ring, PTFE sealing ring and other wearing parts of the actuator, the driving tube body applies a force away from the base, the limit ring and the elastic retaining ring conflict with each other, and as the staff continues to apply force, the elastic retaining ring deforms, so that the limit ring moves to the side of the elastic retaining ring away from the cover body, so that the tube body and the base are separated, which makes it convenient for the staff to replace the wearing parts on the base and piston structure, thereby reducing the maintenance cost of the pneumatic actuator; conversely, the tube body and the base can be quickly assembled.

[0008] Optionally, the piston structure includes a piston disc and a spring arranged in the accommodating hole, and a fixing tube arranged on the side of the base facing the cover body, the end of the piston disc away from the cover body is provided with a plug that can be inserted into the fixing tube, the outer circumferential surface of the plug is provided with a plug hole, and the plug hole is provided with an insert rod, the movable part includes an operating cylinder sleeved on the outside of the plug, the outer circumferential surface of the movable part is provided with a spiral guide hole, the fixing tube is sleeved on the outside of the movable part, and the end surface of the fixing tube facing the piston disc is provided with a guide groove, the insert rod is slidably arranged in the spiral guide hole and the guide groove, one end of the spring abuts against the piston disc, and the other end of the spring abuts against the base.

[0009] By adopting the above technical solution, since the insertion rod is slidably arranged in the guide groove, the insertion rod can only move along the axial direction of the fixed pipe; when air is delivered to between the cover body and the piston disc, the piston disc is driven to move toward the base, and the spring is compressed and deformed at the same time. Since the insertion rod is located in the spiral guide hole, the insertion rod drives the operating movable part to rotate during the movement of the insertion rod toward the base, thereby realizing the rotation of the valve stem connected to the movable part; conversely, the spring reset drives the piston disc to reset, even if the insertion rod is reset.

[0010] Optionally, the spring is sleeved outside the fixing tube, and the end surface of the cover body facing the base is provided with a first limiting groove for inserting the spring.

[0011] By adopting the above technical solution, the spring is in the first limiting groove, so that the position of the spring is not easily shifted when the spring is deformed or reset.

[0012] Optionally, the rod sleeve is provided with a first roller and a second roller, the first roller is located in the guide groove, and the second roller is located in the spiral guide hole.

[0013] By adopting the above technical solution, when the insertion rod moves along the axis of the accommodating hole, the first roller contacts the inner wall of the guide groove, and the first roller can rotate in the guide groove, while the second roller contacts the inner wall of the wire hole, and the second roller can rotate in the guide groove. The design of the first roller and the second roller can reduce the wear of the insertion rod.

[0014] Optionally, a positioning ring groove is provided on the inner circumferential surface of the fixed tube, a positioning hole is provided on the bottom wall of the positioning ring groove, a polyfluoro arc strip is arranged in the positioning ring groove, a positioning block which can be inserted into the positioning hole is arranged on the arc surface of the polyfluoro arc strip away from the axis of the fixed tube, and the inner arc surface of the polyfluoro arc strip is in contact with the outer circumferential surface of the fixed tube.

[0015] By adopting the above technical solution, the polytetrafluoroethylene arc strip can reduce the friction resistance encountered by the insertion rod during movement and has the effect of fixing the position of the parts.

[0016] Optionally, the base has an end surface facing the cover body with a first mounting groove for inserting an operating cylinder, an end surface of the base away from the cover body with a countersunk groove, a bottom wall of the first mounting groove with a mounting hole connected to the countersunk groove, and the movable part includes an operating rod arranged on the side of the operating cylinder away from the cover body, the operating rod is passed through the mounting hole, a retaining ring groove is provided on the outer circumferential surface of the operating rod, a spiral retaining spring is arranged in the retaining ring groove, and the spiral retaining spring is in contact with the bottom wall of the countersunk groove.

[0017] By adopting the above technical solution, the operating rod is passed through the operating hole, and then a spiral retaining spring is installed on the operating rod, so that the spiral retaining spring cooperates with the base to connect the movable part with the base, and the axis of the movable part is positioned; the spiral retaining spring can be installed manually without the need for additional special tools, and has the effect of quick disassembly and assembly.

[0018] Optionally, a limiting structure for limiting the rotation angle of the movable part is provided on the base, a second mounting groove is provided on the bottom wall of the first mounting groove, the second mounting groove is connected to the mounting hole, a first limiting hole and a second limiting hole connected to the second mounting groove are provided on the outer circumferential surface of the base, the vertical center axis of the operating cylinder is located between the first limiting hole and the second limiting groove, the limiting structure includes a limiting block provided on the circumferential surface of the operating rod, a first limiting rod threadedly connected to the first limiting hole, and a second limiting rod threadedly connected to the second limiting hole, when the first limiting rod / the second limiting rod is inserted into the second mounting groove, the first limiting rod / the second limiting rod can be located on the rotation path of the limiting block.

[0019] By adopting the above technical solution, during the rotation of the movable part, the limit block contacts the first limit rod / the second limit rod, restricting the movable part from continuing to rotate, thereby playing a limiting role; by controlling the length of the first limit rod / the second limit rod inserted into the second installation groove, the rotation range of the limit block in the second installation groove is adjusted, that is, the rotation range of the movable part is adjusted.

[0020] Optionally, a second ventilation groove is provided on the upper end surface of the base, a second ventilation hole connected to the second ventilation groove is provided on the circumferential surface of the base, and a muffler is threadedly connected to the inner surface of the second ventilation hole.

[0021] By adopting the above technical solution, when the piston disc moves toward the base, the air between the piston disc and the base is pressed out to the outside through the second ventilation groove and the second ventilation hole, and the spring is compressed and deformed at the same time; when the spring resets and drives the piston disc to reset, the outside air re-enters between the piston disc and the base through the second ventilation hole and the second ventilation groove. In the above process, the muffler can reduce the noise generated when the actuator is working.

[0022] Optionally, an outer circumferential surface of the tube body facing the cover body is chamfered, and a welding space is formed between the chamfered inclined surface and the cover body.

[0023] By adopting the above technical solution, when the cover body and the tube body are welded together, the solder fully fills the welding space, increases the welding area, and improves the strength and stability of the cover body and the tube body after welding; the solder will not exceed the outer circumferential surface of the tube body, thereby improving the aesthetics of the actuator.

[0024] Optionally, a reserved socket connected to the accommodating hole is formed at one end of the cover body away from the tube body, and a blocking bolt is threadedly connected to the reserved socket.

[0025] By adopting the above technical solution, a detection device can be installed on the cover body through the reserved socket to improve the performance of the actuator. For example, when the cover body is installed with a position sensor, the position of the piston disk can be monitored to ensure that it moves according to the predetermined path and speed; when the actuator is not connected to other detection devices, the sealing bolt blocks the vent to prevent external dust and foreign matter from entering the receiving hole.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. When it is necessary to replace the wearing parts such as the sealing ring and PTFE sealing ring inside the actuator, the driving tube body applies a force away from the base, and the limit ring and the elastic snap ring collide with each other. As the staff continues to apply force, the elastic snap ring deforms, so that the limit ring moves to the side of the elastic snap ring away from the cover body, so that the tube body and the base are separated, which is convenient for the staff to replace the wearing parts on the base and piston structure, reducing the maintenance cost of the pneumatic actuator; conversely, the tube body and the base can be quickly assembled; 2. The spiral retaining spring is adopted, and the operating rod and the spiral retaining spring can be disassembled and assembled without the aid of tools, which has the advantage of quick disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of the structure of an embodiment of the present application; Figure 2 is along Figure 1 Sectional view along line AA; Figure 3 is a cross-sectional view highlighting the cover structure; Figure 4 It is a cross-sectional view highlighting the structure of the moving parts; Figure 5 is along Figure 2 A magnified schematic diagram of part B; Figure 6 It is a cross-sectional view highlighting the base structure.

[0029] Figure numerals: 1, tube body; 11, accommodating hole; 12, chamfer; 13, locking ring groove; 14, elastic snap ring; 2, cover body; 21, first ventilation groove; 22, first ventilation hole; 23, reserved socket; 24, blocking bolt; 25, second limiting groove; 3, base; 31, limiting ring; 32, first sealing ring; 33, first mounting groove; 331, second mounting groove; 34, countersunk groove; 341, mounting hole ; 35, first mounting ring groove; 351, connecting ring groove; 36, second ventilation groove; 361, second ventilation hole; 362, muffler; 37, first groove; 371, first limiting hole; 38, second groove; 381, second limiting hole; 39, first limiting groove; 4, movable part; 41, operating cylinder; 411, circular groove; 412, spiral guide hole; 413, third mounting ring groove; 414, fourth fourth fluorine sealing ring; 42, operating rod; 421, slot; 422, retaining ring groove; 423, spiral retaining spring; 43, operating ring; 44, first polytetrafluoroethylene sealing ring; 45, sealing gasket; 46, second polytetrafluoroethylene sealing ring; 47, second sealing ring; 5, piston structure; 51, piston disc; 511, second sealing ring groove; 512, second mounting ring groove; 513, third polytetrafluoroethylene sealing ring; 514, third sealing ring; 52, plug column; 521, plug hole; 522, plug rod; 523, first roller; 524, second roller; 53, fixing tube; 531, guide groove; 532, positioning ring groove; 533, positioning hole; 534, polytetrafluoroethylene arc strip; 535, positioning block; 54, spring; 6, limiting structure; 61, limiting block; 62, first limiting rod; 63, second limiting rod; 64, first nut; 65, second nut. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-6 This application is described in further detail.

[0031] This embodiment discloses a pneumatic actuator. Figure 1 and Figure 2 , a pneumatic actuator comprises a tube body 1, a cover body 2 and a base 3. An accommodating hole 11 is formed on the end surface of the tube body 1.

[0032] Reference Figure 1 and Figure 2 , the cover 2 is arranged on one side of the tube body 1 along the axial direction. The cover 2 is connected to the tube body 1 by welding. A chamfer 12 is provided at the junction between the end surface of the tube body 1 facing the cover 2 and the outer circumferential surface of the tube body 1. A welding space is formed between the cover 2 and the cross section of the chamfer 12. When the cover 2 is connected to the tube body 1 by welding, the solder remains in the welding space, which improves the aesthetics of the actuator.

[0033] Reference Figure 2 and Figure 3 A first ventilation groove 21 is formed on the end surface of the cover body 2 facing the tube body 1 , and a first ventilation hole 22 is formed on the outer circumferential surface of the cover body 2 . The first ventilation hole 22 is connected to the first ventilation groove 21 .

[0034] Reference Figure 2 and Figure 3 The end surface of the cover body 2 away from the tube body 1 is provided with a reserved socket 23, which is connected to the receiving hole 11. The reserved socket 23 can be connected to the detection device. A blocking bolt 24 is threadedly connected to the vent hole. When the actuator is not connected to the detection device, dust and foreign matter in the air can be prevented from entering the receiving hole 11.

[0035] Reference Figure 2 and Figure 4 The base 3 is inserted into the receiving hole 11 from the end of the tube body 1 away from the cover body 2. Two limiting rings 31 are fixedly connected to the outer circumference of the base 3. A first sealing ring 32 is provided on the outer sleeve of the base 3, and the first sealing ring 32 is located between the two limiting rings 31.

[0036] Reference Figure 2 The inner wall of the receiving hole 11 is provided with a locking ring groove 13, and an elastic snap ring 14 is arranged in the locking ring groove 13. When the base 3 moves in a direction away from the base 3, the elastic snap ring 14 is located on the moving path of the limiting ring 31. After the limiting ring 31 contacts the elastic snap ring 14, the base 3 is continuously driven to move in a direction away from the cover body 2, so that the elastic snap ring 14 is deformed, so that the base 3 can be pulled out of the receiving hole 11, thereby separating the base 3 from the tube body 1.

[0037] Reference Figure 2 and Figure 5 The end surface of the base 3 facing the cover body 2 is provided with a first mounting groove 33, and the bottom wall of the first mounting groove 33 is provided with a second mounting groove 331. The end surface of the base 3 away from the cover body 2 is provided with a countersunk groove 34. The bottom wall of the countersunk groove 34 is provided with a mounting hole 341, and the mounting hole 341 is connected to the second mounting groove 331.

[0038] Reference Figure 2 and Figure 4 The base 3 is rotatably connected with a movable member 4, and the movable member 4 includes an operating cylinder 41, an operating rod 42 and an operating ring 43. The operating cylinder 41 is inserted into the first mounting groove 33. The end surface of the operating cylinder 41 facing the cover body 2 is provided with a circular groove 411.

[0039] Reference Figure 2 and Figure 5The operating rod 42 is fixedly connected to the end face of the operating cylinder 41 away from the cover body 2. The operating rod 43 is coaxially arranged with the operating cylinder 41. The operating rod 42 passes through the second mounting groove 331 and the mounting hole 341 in sequence, and is inserted into the countersunk groove 34. The end face of the operating rod 42 away from the operating cylinder 41 is provided with a slot 421. The slot 421 can be inserted with the valve stem of the valve.

[0040] Reference Figure 2 and Figure 5 The operating rod 42 is provided with a first polytetrafluoroethylene sealing ring 44 and a sealing gasket 45. The first polytetrafluoroethylene sealing ring 44 is located on the side of the sealing gasket 45 facing the operating cylinder 41. The sealing gasket 45 is made of non-metallic material.

[0041] Reference Figure 2 and Figure 5 The inner circumference of the first PTFE sealing ring 44 is in contact with the circumference of the operating rod 42. The end surface of the first PTFE sealing ring 44 facing the operating cylinder 41 is provided with a first annular groove, which is connected to the outer circumference of the first PTFE sealing ring 44.

[0042] Reference Figure 2 and Figure 5 The bottom wall of the first annular groove fits with the bottom wall of the countersunk groove 34 , and the inner circumferential surface of the first annular groove fits with the inner wall of the mounting hole 341 .

[0043] Reference Figure 3 and Figure 5 The outer circumferential surface of the operating rod 42 is provided with a snap ring groove 422, and a spiral snap ring 423 is assembled in the snap ring groove 422. The spiral snap ring 423 is located in the countersunk groove 34. One end of the spiral snap ring 423 abuts against the sealing gasket 45.

[0044] Reference Figure 4 and Figure 5 The outer circumference of the operating rod 42 is fixedly connected with an operating ring 43, and the operating ring 43 is located in the second mounting groove 331. One end of the operating ring 43 is fixedly connected to the operating cylinder 41. The outer circumference of the operating ring 43 is in contact with the inner wall of the second mounting groove 331.

[0045] Reference Figure 2 and Figure 5 The outer cover of the operating ring 43 is provided with a second PTFE sealing ring 46 and a second sealing ring 47. The second sealing ring 47 is located on the side of the second PTFE sealing ring 46 away from the operating cylinder 41. The inner circumference of the second mounting groove 331 is provided with a first mounting ring groove 35, and the second sealing ring 47 can be inserted into the first mounting ring groove 35.

[0046] Reference Figure 5 and Figure 6The inner circumference of the second mounting groove 331 is provided with a connecting annular groove 351, and the connecting annular groove 351 is located between the first mounting annular groove 35 and the first mounting groove 33. One end of the connecting annular groove 351 is connected to the first mounting groove 33, and the other end of the connecting annular groove 351 is connected to the first mounting annular groove 35.

[0047] Reference Figure 5 and Figure 6 The inner circumference of the second tetrafluoroethylene sealing ring 46 is in contact with the outer circumference of the operating ring 43 . One end surface of the second tetrafluoroethylene sealing ring 46 is in contact with the operating tube 41 .

[0048] Reference Figure 5 and Figure 6 The end surface of the second PTFE sealing ring 46 away from the operating tube 41 is provided with a second annular groove, and the second annular groove is connected to the outer circumferential surface of the second PTFE sealing ring 46. The bottom wall of the second annular groove is in contact with the bottom wall of the first mounting groove 33, and the inner circumferential surface of the second mounting groove 331 is in contact with the circumferential inner wall of the connecting annular groove 351.

[0049] Reference Figure 3 and Figure 4 The end surface of the base 3 facing the cover body 2 is provided with a second ventilation groove 36, and the outer circumferential surface of the cover body 2 is provided with a second ventilation hole 361, which is located outside the tube body 1 and communicates with the second ventilation groove 36. A muffler 362 is connected to the inner thread of the second ventilation hole 361.

[0050] Reference Figure 2 A piston structure 5 is disposed in the receiving hole 11 , and the piston structure 5 is used to drive the movable member 4 to rotate. The piston structure 5 includes a piston plate 51 , a plug column 52 , a fixing tube 53 and a spring 54 .

[0051] Reference Figure 2 and Figure 4 The piston disc 51 is arranged in the receiving hole 11, and the outer circumferential surface of the piston disc 51 is provided with a second sealing ring groove 511 and a second mounting ring groove 512. A third tetrafluoroethylene sealing ring 513 is arranged in the second sealing ring groove 511. The outer circumferential surface of the third tetrafluoroethylene sealing ring 513 is in contact with the inner wall of the receiving hole 11. The second mounting ring groove 512 is located on the side of the second sealing ring groove 511 away from the cover body 2. A third sealing ring 514 is arranged in the second mounting ring groove 512.

[0052] Reference Figure 2 and Figure 4 The plug post 52 is fixedly connected to the end surface of the piston disc 51 facing the base 3. The plug post 52 can be inserted into the circular groove 411. The outer circumferential surface of the plug post 52 is provided with a plug hole 521, and the plug hole 521 is penetrated by a plug rod 522. Both ends of the plug rod 522 extend out of the plug hole 521.

[0053] Reference Figure 2 and Figure 4 The insert rod 522 is sleeved with two first rollers 523 and two second rollers 524, and the insert rod 522 is located between the two second rollers 524. The second rollers 524 and the insert rod 522 are both located between the two first rollers 523.

[0054] Reference Figure 2 and Figure 4 The outer circumferential surface of the operating cylinder 41 is provided with two spiral guide holes 412, and the two spiral guide holes 412 are arranged in a circumferential array along the axis direction of the operating cylinder 41. The insert rod 522 is slidably disposed in the spiral guide hole 412, and the second roller 524 is located in the spiral guide hole 412.

[0055] Reference Figure 2 and Figure 4 The inner circumference of the operating cylinder 41 is provided with a third mounting ring groove 413 , and a fourth tetrafluoroethylene sealing ring 414 is arranged in the third mounting ring groove 413 . The inner circumference of the fourth tetrafluoroethylene sealing ring 414 is in contact with the outer circumference of the plug post 52 .

[0056] Reference Figure 2 and Figure 4 The fixed tube 53 is fixedly connected to the end surface of the base 3 facing the cover body 2, and the inner cavity of the fixed tube 53 is communicated with the first installation groove 33. The operating cylinder 41 is inserted into the fixed tube 53, and the end surface of the fixed tube 53 away from the base 3 is provided with two guide grooves 531, and the two guide grooves 531 are distributed in an array around the axis of the fixed tube 53. The inner circumferential surface of the fixed tube 53 and the outer circumferential surface of the fixed tube 53 are both communicated with the guide groove 531. The insertion rod 522 is slidably arranged in the guide groove 531, and the first roller 523 is located in the guide groove 531.

[0057] Reference Figure 2 and Figure 4 The inner circumference of the fixed tube 53 is provided with a positioning annular groove 532, and the bottom wall of the positioning annular groove 532 is provided with a positioning hole 533. The positioning annular groove 532 is provided with a polytetrafluoroethylene arc strip 534, and the outer circumference of the polytetrafluoroethylene arc strip 534 is fixedly connected with a positioning block 535, and the positioning block 535 is inserted into the positioning hole 533. The inner arc surface of the polytetrafluoroethylene arc strip 534 is in contact with the outer circumference of the operating tube 41.

[0058] Reference Figure 2 and Figure 4 The end surface of the base 3 facing the cover body 2 is provided with a first limiting groove 39, and the second ventilation groove 36 is connected to the first limiting groove 39. The end surface of the cover body 2 facing the base 3 is provided with a second limiting groove 25, and the spring 54 is sleeved outside the fixing tube 53. The spring 54 is in a compressed state. One end of the spring 54 abuts against the bottom wall of the first limiting groove 39, and the other end of the spring 54 abuts against the bottom wall of the second limiting groove 25.

[0059] Reference Figure 3 and Figure 4 A limiting structure 6 is provided on the base 3, and the limiting structure 6 is used to limit the rotation angle of the movable member 4. The limiting structure 6 includes a limiting block 61, a first limiting rod 62, a second limiting rod 63, a first nut 64 and a second nut 65.

[0060] Reference Figure 2 and Figure 3 The outer circumferential surface of the base 3 is provided with a first groove 37 and a second groove 38, and the first groove 37 and the second groove 38 are symmetrical with respect to the axis of the base 3. The bottom wall of the first groove 37 is provided with a first limiting hole 371, and the first limiting hole 371 is communicated with the second mounting groove 331. The bottom wall of the second groove 38 is provided with a second limiting hole 381, and the second limiting hole 381 is communicated with the second mounting groove 331.

[0061] Reference Figure 2 and Figure 3 The first limiting rod 62 is threadedly connected to the first limiting hole 371, and one end of the first limiting rod 62 is inserted into the second mounting groove 331. The first nut 64 is threadedly connected to the outside of the first limiting rod 62, and the first nut 64 abuts against the bottom wall of the first groove 37.

[0062] Reference Figure 2 and Figure 3 The second limiting rod 63 is threadedly connected to the second limiting hole 381, and one end of the second limiting rod 63 is inserted into the second mounting groove 331. The second nut 65 is threadedly connected to the outside of the second limiting rod 63, and the second nut 65 abuts against the bottom wall of the second groove 38.

[0063] Reference Figure 2 , Figure 3 and Figure 4 , the limit block 61 is located in the second installation groove 331. The limit block 61 is fixedly connected to the outer circumferential surface of the operating rod 42, and one end of the limit block 61 is fixedly connected to the operating ring 43. When the first limit rod 62 / the second limit rod 63 is inserted into the second installation groove 331, the first limit rod 62 / the second limit rod 63 can be located on the rotation path of the limit block 61.

[0064] The implementation principle of a pneumatic actuator in an embodiment of the present application is as follows: air enters between the cover body 2 and the piston disc 51 through the first air vent 22 and the first air vent groove 21. As the air between the cover body 2 and the piston disc 51 increases, the piston disc 51, the plug column 52 and the plug rod 522 move toward the base 3 together; the base 3 is installed on the valve device, and the fixed tube 53 is integrated with the base 3, and the fixed tube 53 and the base 3 are fixed, so that the plug rod 522 moves in the guide groove 531 along the axial direction of the fixed tube 53. Since the plug rod 522 is located in the spiral guide hole 412, the plug rod 522 drives the movable part 4 to rotate while moving along the axial direction of the fixed tube 53, even if the valve stem connected to the movable part 4 rotates.

[0065] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0066] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatic actuator, comprising a tube body (1), characterized in that: The end surface of the tube body (1) is provided with a receiving hole (11), one end of the tube body (1) is provided with a cover body (2), the end surface of the receiving hole (11) away from the cover body (2) is plugged with a base (3), the inner circumferential surface of the receiving hole (11) is provided with a locking ring groove (13), an elastic snap ring (14) for limiting separation from the receiving hole (11) is arranged in the locking ring groove (13), a limiting ring (31) is arranged on the outer circumferential surface of the base (3), a movable part (4) located in the receiving hole (11) is rotatably connected to the base (3), and a piston structure (5) for driving the movable part (4) to rotate is arranged in the receiving hole (11); when the base (3) moves in a direction away from the cover body (2), the elastic snap ring (14) is located on the moving path of the limiting ring (31).

2. A pneumatic actuator according to claim 1, characterized in that: The piston structure (5) comprises a piston disc (51) and a spring (54) arranged in the accommodating hole (11), and a fixing tube (53) arranged on the side of the base (3) facing the cover body (2); an inserting column (52) capable of being inserted into the fixing tube (53) is arranged at one end of the piston disc (51) away from the cover body (2); an inserting hole (521) is formed on the outer circumferential surface of the inserting column (52); an inserting rod (522) is inserted into the inserting hole (521); and the movable part (4) comprises a sleeve arranged on the inserting column (52). The movable part (4) is provided with a spiral guide hole (412) on its outer circumferential surface. The fixed tube (53) is sleeved on the outside of the movable part (4). The fixed tube (53) is provided with a guide groove (531) on its end surface facing the piston disc (51). The insertion rod (522) is slidably arranged in the spiral guide hole (412) and the guide groove (531) at the same time. One end of the spring (54) is in contact with the piston disc (51), and the other end of the spring (54) is in contact with the base (3).

3. A pneumatic actuator according to claim 2, characterized in that: The spring (54) is sleeved outside the fixing tube (53), and the end surface of the cover body (2) facing the base (3) is provided with a first limiting groove (39) for the spring (54) to be inserted.

4. A pneumatic actuator according to claim 2, characterized in that: The outer sleeve of the insertion rod (522) is provided with a first roller (523) and a second roller (524); the first roller (523) is located in the guide groove (531), and the second roller (524) is located in the spiral guide hole (412).

5. A pneumatic actuator according to claim 2, characterized in that: The inner circumferential surface of the fixed tube (53) is provided with a positioning annular groove (532), the bottom wall of the positioning annular groove (532) is provided with a positioning hole (533), a polytetrafluoroethylene arc strip (534) is arranged in the positioning annular groove (532), a positioning block (535) which can be inserted into the positioning hole (533) is arranged on the arc surface of the polytetrafluoroethylene arc strip (534) away from the axis of the fixed tube (53), and the inner arc surface of the polytetrafluoroethylene arc strip (534) is in contact with the outer circumferential surface of the fixed tube (53).

6. A pneumatic actuator according to claim 2, characterized in that: The base (3) is provided with a first mounting groove (33) on the end surface facing the cover body (2) for inserting the operating cylinder (41), and the base (3) is provided with a countersunk groove (34) on the end surface away from the cover body (2). The bottom wall of the first mounting groove (33) is provided with a mounting hole (341) connected to the countersunk groove (34). The movable part (4) comprises an operating rod (42) arranged on the side of the operating cylinder (41) away from the cover body (2), the operating rod (42) is inserted into the mounting hole (341), and the outer circumferential surface of the operating rod (42) is provided with a snap ring groove (422), and a spiral snap ring (423) is arranged in the snap ring groove (422), and the spiral snap ring (423) contacts the bottom wall of the countersunk groove (34).

7. A pneumatic actuator according to claim 6, characterized in that: The base (3) is provided with a limiting structure (6) for limiting the rotation angle of the movable part (4); the bottom wall of the first mounting groove (33) is provided with a second mounting groove (331); the second mounting groove (331) is connected to the mounting hole (341); the outer circumferential surface of the base (3) is provided with a first limiting hole (371) and a second limiting hole (381) connected to the second mounting groove (331); the vertical center axis of the operating cylinder (41) is located between the first limiting hole (371) and the second limiting groove ( 25), the limiting structure (6) includes a limiting block (61) arranged on the circumferential surface of the operating rod (42), a first limiting rod (62) threadedly connected to the first limiting hole (371), and a second limiting rod (63) threadedly connected to the second limiting hole (381), when the first limiting rod (62) / the second limiting rod (63) is inserted into the second mounting groove (331), the first limiting rod (62) / the second limiting rod (63) can be located on the rotation path of the limiting block (61).

8. The pneumatic actuator according to claim 1, characterized in that: A second ventilation groove (36) is provided on the upper end surface of the base (3), a second ventilation hole (361) connected to the second ventilation groove (36) is provided on the circumferential surface of the base (3), and a silencer (362) is connected to the inner thread of the second ventilation hole (361).

9. The pneumatic actuator according to claim 1, characterized in that: The outer circumferential surface of the tube body (1) facing the cover body (2) is provided with a chamfer (12), and a welding space is formed between the inclined surface of the chamfer (12) and the cover body (2).

10. The pneumatic actuator according to claim 1, characterized in that: A reserved socket (23) communicating with the receiving hole (11) is provided at one end of the cover body (2) away from the tube body (1), and a blocking bolt (24) is connected to the inner thread of the reserved socket (23).

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